Three people are in hospital including a teenage girl who is in a serious condition after falling ill at Coloursfest at Braehead Arena.
The 19-year-old is currently in a critical condition at the Queen Elizabeth University Hospital in Glasgow.
A 21-year-old man, also being treated at the Queen Elizabeth is thought to be stable.
A third person, a 31-year-old woman is being treated at the Royal Alexandra Hospital in Paisley.
Police Scotland have confirmed that an investigation is under way but believe the three incidents are not thought to be directly connected.
Coloursfest is Scotland’s longest running dance festival and is now in its 17th year.